<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button id="btn">节流</button>
    <script>
        const sumbit = (e) => {
            console.log(e)
        }
        const debunce = (fn, delay) => {
            let beigin = 0
            return function () {
                let cur = new Date().getTime()
                console.log(cur, beigin, cur - beigin)
                if (cur - beigin > delay) {
                    fn.apply(this, arguments)
                    beigin = cur
                }

            }
        }

        // btn.addEventListener('click', function () { alert(2) }, false)
        btn.addEventListener('click', debunce(sumbit, 5000), false)

    </script>


</body>

</html>